Ex) Compound Wheel Find Net Torque, Both F =50. N r1 = 30 cm, r2 = 50 cm
A 30 cm disk and a 50. cm disk are attached to an axle that passes through their centers. If a 50. N force hangs from the 30. cm disk and a 50. N force is applied to the 50. cm disk a shown above what is the net torque on the compound wheel CW negative CCW positive
tnet = = .30 m(50. N) - .50 m(50. N)sin120°
- 6.7 mN
Ex 2) A 2.20 m uniform beam with a mass of 25.0 kg has a 28.0 kg sign attached to it. Find all the forces on the beam
Find the tension on the cable T and the components of wall's force on the beam Fwally Fwallx
I. Finding Cable Tension St = 0
TsinqL = mgL/2+MgL
Tsinq = mg/2+Mg
Tsin30 = mg/2+Mg
T/2 = mg/2+Mg
Ex 2) A 2.20 m uniform beam with a mass of 25.0 kg has a 28.0 kg sign attached to it.
T = mg + 2Mg = 25.0 kg(9.8 m/s2)+ 2(28.0 kg)(9.8 m/s2)
T = 794 N
II. Find Fwally & Fwallx
Tcosq = Fwallx
=794 Ncos30
Fwallx = 687 N
II. Find Fwally
SFy = 0
mg + Mg = Fwally + Tsin30
Fwally = 123 N
Giancoli - p. 248) 18, 20, 21
ŠTony Mangiacapre.,
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